Try and get through to the CEO's office, has worked for me in the past for other stuff... Not sure who you'd have to contact but worth a quick search, sounds like you've exhausted the usual channels... There are a couple of Apple employees on here, maybe they'll chime in shortly...
Sounds bloody awful. You might need to go bat shit crazy on them. Get consumer rights involved.
Good luck. Have been reading your plight and it's more than I would of been able to deal with.